Shooting stars aren't stars at all: they're bits of space dust, often no bigger than a grain of sand. They hit the atmosphere at tens of kilometres per second, and the air compressed in front of them heats them until they glow, some 80 to 100 km up. A speck that tiny is enough to paint that streak of light.
A large share of Earth's water molecules formed in the interstellar cloud that existed before the Sun was even born, more than 4.6 billion years ago. You are literally drinking a cosmic fossil.
By day, the Martian sky looks butterscotch because of fine dust hanging in the air. But at dusk, those same grains scatter blue light forward, creating a bluish glow around the Sun. Rovers have photographed these blue sunsets: the exact reverse of what we see on Earth.